Yeast Conversion Calculator
Fresh, active dry, or instant. Convert with confidence.
Three types of yeast are common in baking: fresh yeast (also called cake yeast or compressed yeast), active dry yeast, and instant yeast (also called rapid-rise or bread machine yeast). Each one behaves differently and has different usage rates.
A European recipe might call for 20 g fresh yeast; an American recipe for 7 g active dry yeast; a modern quick-bread recipe for instant yeast in a 1:1 substitution. This converter handles all three directions. Standard conversion ratios: 1 part fresh yeast = 0.4 parts active dry yeast = 0.33 parts instant yeast.
In practical terms: if a recipe calls for 20 g fresh yeast, use 8 g active dry or 6.5 g instant. These ratios assume typical dough hydration and rising conditions. For cold-fermented doughs (12+ hour overnight rise), reduce any yeast type by 25-50% since you have more time for rising.
Equivalent amounts
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Conversion Reference
Standard yeast conversions by weight.
| Fresh | Active dry | Instant |
|---|---|---|
| 30 g fresh | 12 g active dry | 10 g instant |
| 20 g fresh | 8 g active dry | 6.5 g instant |
| 10 g fresh | 4 g active dry | 3.3 g instant |
| 17.5 g fresh | 7 g active dry (1 US packet) | 6 g instant |
| 1 US packet | 7 g active dry | 2.25 tsp |
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The Reference
Fresh yeast is 70% water, which is why you need about 2.5 times more by weight than dry. Active dry yeast requires proofing (rehydrating in warm water before use). Instant yeast can be mixed directly into dry ingredients.
The conversion ratios are 1 : 0.4 : 0.33 (fresh : active dry : instant) by weight. For long fermentation (12+ hours), reduce all yeast amounts by 25 to 50%. More time means less yeast is needed.
The Three Yeasts Explained
Fresh yeast (also called cake yeast, compressed yeast, or baker's yeast in Europe) is living yeast in a moist cake form. It has the most delicate flavor but the shortest shelf life (2-3 weeks refrigerated). Professional bakeries often use fresh yeast exclusively for its nuanced bread flavor.
Active dry yeast is yeast that has been dried to dormancy. It requires proofing (rehydrating in warm water) before use, though modern manufacturing has made this step increasingly optional. Shelf life is about 12 months sealed in a cool pantry.
Instant yeast (also called rapid-rise or bread machine yeast) is finer-grained active dry yeast that can be added directly to dry ingredients without proofing. It works faster than active dry because more particles dissolve quickly. Shelf life is similar to active dry.
For substitution: 1 part fresh yeast equals 0.4 parts active dry equals 0.33 parts instant (by weight). For long, slow fermentation (cold overnight ferments), reduce yeast amounts by 25-50% because more time means less yeast is needed. Our dough hydration calculator and baker's percentage calculator help you think about yeast as a percentage of total flour.
How to Use
- Choose the yeast type you have.
- Enter the amount, in grams, teaspoons, or packets.
- See equivalents for the other yeast types.
Frequently Asked Questions
Can I substitute one yeast type for another?
Yes, using the conversion ratios above. Fresh yeast has a shorter shelf life (2-3 weeks refrigerated) but produces more complex flavor. Dry yeasts (active or instant) last months in the pantry. Instant yeast is the most convenient for beginners. No proofing required.
Do I need to proof active dry yeast?
Traditional advice says yes (dissolve in warm water first). Modern manufacturing makes this optional. Many active dry yeasts can be added directly to dry ingredients like instant yeast. Check your specific brand's instructions. Proofing takes 5 minutes and confirms the yeast is alive.
What is the difference between instant yeast and rapid-rise yeast?
Usually the same thing, different branding. Rapid-rise is a marketing term for instant yeast that produces faster rises. They are interchangeable in recipes.
How do I know if my yeast is still active?
For dry yeast: mix 1 tsp with 1/2 cup warm water (100-110F) and a pinch of sugar. If it foams within 5-10 minutes, it is active. If no foam, the yeast is dead. Replace it.
Can I reduce yeast in a recipe?
Yes. Reducing yeast extends rise time, which often improves flavor through longer fermentation. Reducing by 50% roughly doubles rise time. For overnight cold ferments, use 25% of the called-for yeast. Beyond 75% reduction, rising becomes unreliable.
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